There was the amount of 30 Baht / 1 USD deducted from my account. Why did this happen?

The banking system in Thailand may check the validity of your card by deducting a small amount and refunding it immediately. If you did not receive the refund within 24 hours, please check directly with your bank before contacting us.

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Thai Railways

OK

I don't have a booking number. I have not purchased a ticket yet.